[Dingus]

30
A Simple "to verb" sentence:
She was there to help me walk.

A sentence like the one above:
He was there to make every child suceed and realise its innermost ambitions.

I think the type of sentence you were thinking of was this:
He walked beside me to prevent me from falling to the ground.

34

Agree with wasleys.

38

I think the faint adjective does apply to the character of blue.
So as wasleys says:
It should be either: faint blue or faintly bluish

I think the term "faintly bluish" is used because the writer is not very sure whether it is blue at all; it is a color approaching blue. So it is faintly bluish. If the writer had said bluish alone, then the sentence would carry more conviction about the color of ozone.

Chemical is a noun. Ask yourself: Ozone is active in what way? --> Chemically active.